Multi (i) register techniques help, please.

[Matt Agajanian]

(05-30-2018 09:44 PM)Dieter Wrote:  

(05-30-2018 08:42 PM)Matt Agajanian Wrote:  Hi there. Given that the HP-67 and 34C used only one I register, what are your tips & techniques for using the I register for multiple indirect registers? Thanks in advance.

There is one obvious solution: Use the registers you want and store them into I before the indirect command.

Example: multiply the contents of the registers indexed by R3 and R4.

Code:

RCL 3
STO I
RCL(i)
RCL 4
STO I
R↓
RCL(i)
x

Don't like this? Get a 35s (two index registers). Or an HP41/42 (essentially any register can be used for indirection).

Dieter

This is good! That helps! I’m just looking to your (MoHPC members’) expertise on how to streamline this approach so as to minimize program steps to keep this exchange as low in keystrokes as possible.

Thanks